Improved spring dirk-knife



UNITED STATES PATENT OFFICE CHARLES HIBBARD, .OF CHICAGO, ILLINOIS.

IMPROVED SPRING DIRK-KNIFE.

Specification forming part of Letters Patent No. 57,902, dated September 1l, 1866.

To all whom it may concern: its center, upon which the arms respectively Be it'known that I, CHARLES HIBBARD, of work as a fulcrum. On the under side, near Chicago, in the county of Cook and State of the end of each arm, a nose or catch, c c', is Illinois, have invented a new and Improved formed, the nose c catching into a recess in Spring Dirk-Knife, and I do hereby declare the bolster of the blade when the blade has that the following is a full, clear,r and exact been thrust in for the purpose of keeping it "enable others incased, and the nose c resting against a shoulskilled in the art to make and use the same, der on the bolster of the blade for keepingthe reference being had to the accompanying blade thrust out.l A drawings, forming part or" this specification, The arms ot the catch-bar are operated by a in which" thumb-piece, f, on the back of the knife. B

Figure l is a side view of the knife with the pressing down upon this thumb-piece it throws blade extended. Fig. 2 is a longitudinal verboth catches c c into position to catch the tical section taken in the plane of the line :n x, blade in either a closed or open position, and Fig. l. Fig. 3 is a section taken in the plane byl raising it up with the thumb it releases of the line y y, Fig. l. both the catches c c.

Similar letters ot reference indicate like A pin, g, is provided for drawing back the parts. blade. is pin is run through a hole in the To enable others to understand my invenbolster oi the blade, so that it will, on turning tion, I will proceed to describe it. the handle sidewise, fall out for a short dis- A designates the handle of the knife. he tance, so that it can be taken hold of; and it said handle is hollow, being made of two parts runs along a slot, 7L, Fig. 1, when drawing in and united together by rivets in the usual way. the blade.

Bis the blade, which is fitted to slide in. This knife4 can be easily operated with one and out of the handle in any proper way, and hand, and by reason. of the spring it can be its length is suchv that 1t can be pushed fully allnost instantly adjusted for use. into the handle, so that its pointwill be covl What I claim as new, and desire to secure ered. by Letters Patent, is-

C is a spiral spring located in the handle, 1. The catch-bar D D, having catches c c one end resting against the end wall of the on its ends, in combination with the blade B handle and the other against the blade B. and spiral spring C, substantially as described.

his spring is of a sufficient capacity to vthrow 2. rIhe pin g, in combination with the blade the blade out instantly when the latter has B and spring C, substantially as and for the been released. purpose specified.

D represent the two arms of the catch- CHARLES HIBBARD. bar. These arms are jointed together, as shown Witnesses: at b, and a rivet, c, connecting the two parts MOWRY FANUM,

of the handle, passes through each arm near J. K. BOYD. 

